Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A149416
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =54a(5) =184a(6) =868a(7) =3270a(8) =15797a(9) =62573a(10) =306060a(11) =1252011a(12) =6168402a(13) =25808068a(14) =127724851a(15) =543318743a(16) =2696792155a(17) =11618463835a(18) =57783118598a(19) =251466517576
External references
- oeis: A149416